Apparatus for detecting a magnetic field using a giant magnetoresistance effect multilayer
US5657190A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 18, 1994 |
| Grant date | Aug 12, 1997 |
| Priority date | — |
| Expiry date | Feb 18, 2014 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B2005/3996
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
For preventing output drop with time of a MR magnetic head or similar apparatus, a magnetic field sensor in the form of a giant magnetoresistive element of the induced ferrimagnetic or spin-valve type in which antiparallelism of magnetization is induced between the magnetic layers by external magnetization. A magnetic field detecting apparatus including a magnetic field sensor using a giant magnetoresistive multilayer film of the induced ferrimagnetic type or the like includes a magnetic field generating means such as a permanent magnet. The magnetic field sensor is moved to the proximity of the magnetic field generating means and placed within the magnetic field when the magnetic field sensor is out of use or its detection sensitivity drops.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.